question_answer 32)

  Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid (iii)Evaporation of water (iv)Sublimation of camphor (crystals) (a) 1 and 2                        (b) 2 and 3                              (c) 1 and 4                         (d) 3 and 4

Answer:

  (a) When quick lime reacts with water, a large amount of heat is released along with the formation of calcium hydroxide. Similarly, the process of dissolving an acid or base in water is a highly exothermic reaction. Evaporation of water and sublimation of camphor are endothermic reactions.